CVE-2026-20122

5.4

MEDIUM CVSS 3.1

Cisco Catalyst SD-WAN Manager Incorrect Use of Privileged APIs Vulnerability - [Actively Exploited]

Overview

Description

A vulnerability in the API of Cisco Catalyst SD-WAN Manager could allow an authenticated, remote attacker to overwrite arbitrary files on the local file system. To exploit this vulnerability, the attacker must have valid read-only credentials with API access on the affected system. This vulnerability is due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

Details

INFO

Published Date :

Feb. 25, 2026, 5:25 p.m.

Last Modified :

April 21, 2026, 11:59 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Apr 23, 2026

Alert Date: Apr 20, 2026 | 9 days ago

Description :

Cisco Catalyst SD-WAN Manager contains an incorrect use of privileged APIs vulnerability due to improper file handling on the API interface of an affected system. An attacker could exploit this vulnerability by uploading a malicious file on the local file system. A successful exploit could allow the attacker to overwrite arbitrary files on the affected system and gain vmanage user privileges.

Required Action :

Please adhere to CISA’s guidelines to assess exposure and mitigate risks associated with Cisco SD-WAN devices as outlines in CISA’s Emergency Directive 26-03 (URL listed below in Notes) and CISA’s “Hunt & Hardening Guidance for Cisco SD-WAN Devices (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.

Known Ransomware Campaign Use:

Unknown

Notes :

CISA Mitigation Instructions: https://www.cisa.gov/news-events/directives/ed-26-03-mitigate-vulnerabilities-cisco-sd-wan-systems ; https://www.cisa.gov/news-events/directives/supplemental-direction-ed-26-03-hunt-and-hardening-guidance-cisco-sd-wan-systems ; https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v ; https://nvd.nist.gov/vuln/detail/CVE-2026-20122

Impact

Affected Products

The following products are affected by CVE-2026-20122 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Cisco	catalyst_sd-wan_manager

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	MEDIUM				[email protected]
	CVSS 3.1	MEDIUM				[email protected]

Solution

Apply vendor patches to address arbitrary file overwrite vulnerability in Cisco Catalyst SD-WAN Manager.

Update Cisco Catalyst SD-WAN Manager software.
Apply security patches provided by the vendor.
Restrict API access to trusted sources.
Monitor for unauthorized file modifications.

Public PoC/Exploit Available at Github

CVE-2026-20122 has a 3 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-20122.

URL	Resource
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sdwan-authbp-qwCX8D4v	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20122	US Government Resource

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20122 is associated with the following CWEs:

CWE-648: Incorrect Use of Privileged APIs

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20122 weaknesses.

CAPEC-107: Cross Site Tracing Cross Site Tracing CAPEC-234: Hijacking a privileged process Hijacking a privileged process

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

YurilLAB/WEWAF

None

Go HTML JavaScript CSS TypeScript

Updated: 3 days, 17 hours ago

1 stars 0 fork 0 watcher

Born at : April 21, 2026, 4:10 p.m. This repo has been linked 31 different CVEs too.

PyramidOfPain/CISA-ED-26-03

None

Shell

Updated: 1 month, 3 weeks ago

0 stars 0 fork 0 watcher

Born at : Feb. 27, 2026, 2:27 p.m. This repo has been linked 4 different CVEs too.

DevGreick/devgreick

None

Python

Updated: 4 days, 11 hours ago

1 stars 0 fork 0 watcher

Born at : Oct. 29, 2024, 8:10 p.m. This repo has been linked 10 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-20122 vulnerability anywhere in the article.

The Register

More Cisco SD-WAN bugs battered in attacks

America's lead cyber-defense agency has warned that three Cisco Catalyst SD-WAN Manager bugs are under attack, and given federal agencies just four days to patch the security holes. The US Cybersecuri ...